Multiple purchase jack



Oct. 30, 1923.

J. DRQNSFIELD MULTIPLE PURCHASE JACK Filed May 18. 1922 5 Sheets-Sheet 1 Oct. 30, 1923. 1,472,357

J. DRONSFIELD MULTIPLE PURCHASE JACK Filed May 18, 1.922 5 Sheets-Sheet 2 MM 1Q, WAZ,

A'TTSL 0a. so, 1923( 1,472,357

J. DRONSFIELD MULTIPLE PURCHASE JACK Filed May 18, 1922 5 Sheets-Sheet 3 qua- .x-

ATTY.

Oct. 30, 1923. 11,472,357

J. DRONSFIELD MULTIPLE PURCHASE J'ACK Filed May 18. 1.922 5 Sheets-Sheet 4 WW WM a) yaw/412w Oct. 30, 1923.

J. DRONSFIELD MULTIPLE PURCHASE JACK Filed May 18 1922 5 Sheets-Sheet 5 WWM in the county double or To all vol/mu, it only concern:

at I, JAMES DnoNsrmLo, a subject of the King of Great Britain and .lreland, residing at Atlas Works, Oldham, of Lancaster, England, have and useful Improvements in Purchase Jacks, of which the folis a specification.

invention relates to an improved multiple purchase jack plication to the shafts ers or the like requiring to be clothed, as for example, for use mounting machines or other apparatus, The purpose of the jack is to allow of hand ro gear from a. hand lever as Be it known th in vented new Multiple loi v ing l his tation through is known.

The improved jack is of the accommodating type, that is, applicable to shafts of varyg diameter, as for example shafts between and 25;, the same jack serving over the desired range of diameters as well as being self-centering and self-contained and givingthe desired purchase.

The attached drawings illustrate the conproved multiple purchase struction of the im drawings:

jack, and,'in said 7 Fig l shows a side elevation of the jack,

with the actuating handle removed;

F 2 is a sectional plan the line 22 of Fig. 1..

F 3 is a viewof the main flanged casting or wheel showing the jaws fully closed to suit a shaft for example of 1% the jaw structure being indicated in section.

Fig. 4 shows a similar view but with, the jaws fully open to suit a shaft for example of 2% diameter.

Fig. 5 is a detail sectional view taken on g. 4, looking in the diws.

ETD STATES PATJET the line 55 of Fi rection of the arro I make use of a main flanged casting or wheel. a which is adapted to be rotated and which has an exterior ring of teeth a and a flange of less diameter than the pitch circle of the ring or teeth, and such flanged. casting is bored to a considerable diameter.

Fatenlted Get. 36, 1923.

IEULTIPLE PURCHASE JACK.

Application filed May 18, 1922. Serial No. 561,848.

that said levers have a tal points 6Z2, (Z tioned flanged oppositely arranged, the substantially parallel one central portions of such and form being for ap- 01": cylinders or doffwith relation to cardfulcrumed casting or between said flange and the casting a, a pair of segmental slots 7) (best shown in dotted lines in Figs. 1 and act as guides for a pair of tulcrumed levers (Z about to be described, it being understood 4) adapted to sliding fit in said slots. These fulcrumed levers 65, (Z have each a pivoted cranked extremity (Z, (Z (the pivo on the first menwheel a) and are levers (Z, (Z lying to the other. The levers are thicker a sort of vice or jaw, said levers being cut away in such a manner and their points so disposed as to render them suitable for engagement with any size levers (Z are incide with a line which center of the shaft WlllCll shaft. each half with two four in all) the studs 0, 6

view, taken on release a shaft of any the pivotal action of the lngs in one of sea d levers bolts f pass are oi larger boils.

or otherwise. bored right through at two places vertically or at right-angles to their length, and nonrotatable bolts or studs f,

of shaft to be driven within certain limits; that is tc say, the pivotal centers (Z of the so located that they always co uasses through the is to be acted upon by the j ack when the latter is in position on said shaft, regardless of the diameter of the The prepared jaws may be provided dies or bits 6, e (that is being secured by The aws are f turned to two surrounded by a applied around. the smaller diameter of each bolt, each spring abutting against a provided should washers are applied to each bolt as shown. By turning the nuts 71* in one direction or the other, the jaws can be caused to grip or diameter within the range of the jack. In orderto provide for er 7. Nuts 715 and levers d, the openthrough which the diameter than said thereby to permit the levers to swing on their pivots when acted upon by the nuts 72*, the levers being guided in their move ments'l'iy the slots 7) hereinbefore described.

Combining with such main flanged casting The central bore of the two castings is of or wheel a is a second or auxiliary flanged casting I) which is also bored and which is fixed to the first flanged castlng by studs j ustin nuts If to l rand.

such size as to allow ready access to the which are at all times ready 0 or otherwise. The annular flange of the Fitting the provided flanges if, b on the castingbis cut away at two diametrically opposite points at that edge thereof which 5 abuts against the casting a, so as to form shrouds two castings a, I) already mentioned, are two. or cover plates 9, g which are bored to fit the turned flanges a a wil be understood. ln-addition, these shrouds are bored adjacent one extremity thereof for the reception of a stud it, which is shouldered so as to retain said shrouds spaced apart, and which carries a check pawl h adapted to cooperate with a ratchet wheel hereinafter described. The stud 71. also passes through a head 71?, which is secured to the upper end of asupporting rod or crotch 72?, the lower end of which fits into a pedestal. or socket h on. the floor, in the usual manner. periphery of the castings (b and Z) the shrouds are bored for the reception of a shaft oiaxle which carries the turning handle or lever '1' and. sprocket wheels (as for example two sprocket wheels j j) for the pitch chain which works the screw for the mounting mechanism. On the same shaft or axle is a small pinion and. a ratchet wheel '21 for the pawl it before mentioned. The small pinion i gears with a larger pinion 71: mounted on a shaft is in a third-bore initlie shrouds, and, on the same shaft '70 is a small pinion 70 which gears with. the teeth on the exterior of the main flanged casting or wheel a whereby the required purchase from the lever handle '2'? to the locked gripping vice or jaws engaging the shaft is obtained. The fourth here is for the spacing stud Z at the other extremity of the shrouds.

Obviously. the arrangement of the actual gear maybe varied;

It is clear. that the shrouds llidSk. the power multiplying gear and the whole construction gives a very compact form of jack.

The improved jack. is self-centering, ac commodating, easily applied and removed, powerful and yet simple. It will be read-- ilyunderstood that when a shaft is gripped between the jaws e of the levers (Z, manual rotation of the shaft by means of the lever will be transmitted through the medium of the gearing i, la, 70 and the toothed peripherya. of the flanged casting; a, to the combined castings a, I), thus rotating, the shaft held by the levers. At the same time, the rotation of the shaft [may be transmitted by means of, a chain (not shown) engaging one of the sprocket wheels j, to any desired point, such, for. instance, as the screw. shaft of a card-mounting machine.

I leclare that whatI claim is:

l, Ainultiple purchase jack, comprising concentric castings, oppositely arranged lever elements, hilcrumed between said castings, saidcastings having means for guiding the lever elements in their movements shaft-gripping jaws carried by said lever elements, means for adjusting the jaws to- Wardand from each other thereby to accommodate shafts of varying diameters, an

actuatinghandle, and gearingbetweeir said Between the stud 7! and the arass? cured in concentric relation with the first casting, guide ways in the'castings for permitting movement of the gripping elements, threaded bolts carried by said grip- )in elements for clam )in them uion a shaft to be grippecha pair of shrouds for supporting said castings, a rotatable handle carried by said sarouds, andgearing be- I tween. said handle andcastings, for transmitting rotary. motion of the handle to said gripping elements. V

3. A iiiult-iple purchase jack, comprising a casting, a concentric adjustable vice structure having two lever elements, each of said elements having a cranked extremity fulcruined on said casting, a second. casting secured to said first casting in concentric relation therewith, guide-ways in the castings for thefuloruined lever elements, said lever elements being provided with jaw recesses, threaded members for adjusting the fulcruined lever elements toward and from each other, shroudssupperting saidv concentric castings, an operating handle carried by. the shrouds. andlglear ing between said handle and, castings. for transmitting motion from. the handle to the lever elements.

A multiplepurchase jack, comprising a pair of concentric castings, apair of: fulcrumed' elements disposed between saidicast ings, gripping jaws carriedby. said ful- ('rumed elements, threaded bolts passing through the ful'crumedelementsfor adjust- .ably connecting them, guide ways in the concentric castings fen guiding the fulcrumed 7 elements, shrouds supporting said castings, said shrouds being interconnected, gear wheels carried. by said shrouds and adapted to rotatesaid castings, and; means for operating, said gear wheels.

5. A nultiple purehase ack, comprising a casting, a pair of levers fulcrumed on'saidi casting and provided with self-centeringgripping. jaws, threaded bolts for adjusting the jaws toward and from each other, a second casting secured in concentric relation with the first, means for guiding the fulcrumed levers, shrouds for supporting the concentric castings, gear wheel's sup-' ported by said shrouds and engaging said castings for. rotating the gripping jaws a.

chain. sprocket supportedfor rotation in saidi. shrouds, and: an operating handle;

adaptedto actiiatesaid gear wheels and sprocket. l

In testimony whereof: I have signed my nameto-this; specification.

Janus nnonssmrn. 

